Automatic trembler particularly applicable to warning apparatus.



E. TESTB. AUTOMATIC TREMBLER PARTICULARLY APPLICABLE TO WARNING APPARATUS.

APPLICATION FILED D120. 28, 1908.

977,238. Patented N0v.29, 1910. Fig. 2. Fig.1.

1 BEBBT&SHEET 1.

l V/T/VASSLY uvmwroe %Z 522% Eizenne 179356 THE. rgo mus FYETERS cm, WASHINGTON. 174 c.

E.- TESTE.

AUTOMATIG TREMBLER PARTICULARLY APPLICABLE TO WARNING APPARATUS.

APPLICATION FILED DEC. 28, 1908.

977,238. Patent ed Nov. 29, 1910.

4 SHEETS-SHEET 2.

Fig. 3. Fig. 4.

c] Fig. 5.

n 1 2 k D h s d 1 m u L 11. m

W/T/WFJSZS //W/vr0/? m Etienne 7625-56 n1: NURRIS PETERS cm, WASHINGTON, n. a

E. TESTE.

AUTOMATIC TRBMBLEB. EARTIGULARLY APPLIGABLE 1'0 WARNING APPARATUS.

APPLICATION FILED D150. 28, 1908.

Patented Nov. 29, 1910.

4 SHEETS-SHEET 3.

Fig. 7.

Fig.6.

"iitiii will! THE mums PETERS co., wAsynvarnm n. c

UNITED STATES PATENT GFFTC.

ETIENNE TESTE, 0F PARIS, FRANCE.

AUTOMATIC TR'EMBLER PARTICULARLY APPLICABLE TO WARNING APPARATUS.

To (ZZZ whom it may concern:

Be it known that I, ETIENNE TESTE, of 18 Rue des Bois, in the city of Paris, Republic of France, machine-maker, have invented an Automatic Trembler Particularly Applicable to Warning Apparatus, of which the following is a full, clear, and exact description.

The present invention relates to an automatic trembler, capable of being applied to all forms of acoustic warning apparatus operated by air, gas or steam, such as trumpets, horns, whistles, etc. This trembler is mounted in such a manner that the warning apparatus can produce, at Will, either uniform sounds or tremulous sounds, and it also enables the emission of sound to be entirely suspended. This system of trembler is constituted, in principle, by a hollow piston capable of undergoing displacement, in consequence of the pressure of air or steam, in a cylinder that is in communication with the tube of the warning apparatus. This piston, which is kept pushed back by the pressure of a suitably mounted spring, contains a perforated sleeve of smaller diameter in which is arranged a kind of valve capable of closing the bottom of the piston and the lateral openings of the perforated sleeve, or of being raised from its seat by the pressure of air or steam, thus enabling these openings to be unclosed. The displacement of the piston in the cylinder is limited by a lug which travels in a slit provided in the cylinder wall, and also by a. movable ring, also slotted, mounted upon the cylinder. By setting the slits of the cylinder and ring so as to coincide, the piston is enabled to move in such a manner that a uniform sound is produced. By turning the ring the stroke of the piston is limited, whereupon the air lifts the valve of the perforated sleeve, until the said air escapes through the perforations in the latter. The valve is immediately pulled down again by its spring, and the movement is repeated very quickly, thus producing a tremulous sound. Finally, to entirely stop the emission of sound, all that is necessary is to move the piston lug into a lateral slit arranged at the end of the cylinder slit.

The invention is illustrated in the accompanying drawing which shows the improved trembler applied to a motor horn.

In this drawing, Figure l is a front view of the whole of the warnin apparatus, and Fig. 2 a corresponding sic e view thereof. Fig. 3 is an external view, on a larger scale,

Specification of Letters Patent.

Application filed December 28, 1908.

Patented Nov. 29, 1910. Serial No. 469,578.

of the organs containing the trembler, and Fig. 4 is a vertical section of same. Fig. 5 is another vertical section taken on the line AA of Fig. 3. Fig. 6 is a vertical section along the line BB of Fig. 3. Fig. 7 shows the position occupied by the piston in order to produce a uniform sound. Fig. 8 shows the position occupied by the same piston when a tremulous sound is produced.

As can be seen from the drawing the apparatus comprises as usual, a twisted horn a, and a pneumatic bulb b. The bulb is mounted on a tube a communicating, by means of a connecting piece 0 with a clyinder (Z which is divided into two chambers Z and (Z by a transverse partition 6. The chamber (Z which is in uninterrupted communication with the tube 0, is provided with a valve f which enables air to enter the bulb Z2 with ease. The reed g of the horn a is mounted in the chamber (Z Air is admitted to this chamber through a lateral opening it communicating'with the tube 0 in the manner to be described later on. The chamber (Z is also fitted with a valve 2' allowing the surplus air to escape when the pressure in the said chamber rises above the normal pressure at which the apparatus acts satisfactorily. On the end of the tube 0 is fixed a metal cylinder j closed by a screw cap 7' A hollow piston Z is movably mounted in this cylinder which communicates with the chamber (Z of the cylinder (Z by means of a lateral opening is connecting by a small tube 70 with the opening it of the said chamber, the said piston being formed of a metal tube, closed at one end and provided laterally with a circular opening Z The piston Z is kept pushed down in the bottom of the cylinder j by the action of a coiled spring at which is supported at one end by the end of the said cylinder, and at the other by the cap j of this latter. Inside the piston Z is lodged a perforated sleeve 1% of smaller diameter and provided with lateral apertures W. This perforated sleeve is closed at the one end by a threaded cap n provided with a central orifice n and is fixed in the interior of the piston Z by means of a screw cap 0 in one piece with the perforated sleeve and provided in the center with a large orifice 0 Inside the perforated sleeve, mounted inthis way, is a kind of movable valve formed by a metal socket p, the bottom of which is able to mask the orifice 0 of the cap 0, While the edges are equally able to mask the lateral apertures n of the said perforated sleeve. The socket p is held in position against the cap 0 by means of a coiled spring 9 lodged inside the perforated sleeve. On the piston Z is fixed a lug 1 which is adapted to slide in a slit 8 suitably provided in the cylinder j. This slit is adapted to coincide with a slit of equal width t provided in a movable ring it mounted on the cylinder j. This ring carries at the one end a flange a and is intended to limit the stroke of the piston Z as will be explained below. A lateral slit 8 forming a right angle with the slit 8 of the cylinder, and in which the lug 7" is adapted to engage, enables the piston Z to be rendered immovable for the purpose of suspending the emission of sound entirely.

The'apparatus arranged as above, works in the following manner: When the production of a uniform sound is desired, the movable ring a is turned in such a manner that the slit t of this ring coincides with the slit 8 of the cylinder j. Thus air, striking against the bottom of the piston Z, forces the latter along inside the cylinder until the lug 9, sliding in the slits t and 8 comes in contact with the bottom of the slit t. At this moment, the piston Z has moved far enough to uncover the lateral aperture is of the cylinder The air then escapes through this aperture and through the tube into the chamber (Z of the cylinder (l where it enters the reed g of the horn a. The piston Z is afterward returned to the bottom of the cylinder 9' by the action of the coiled spring, m. The sound emitted is uniform and analogous to that of ordinary warning horns. If the pressure of the air in the chamber d is too powerful for the satisfactory working of the apparatus, the surplus air escapes through the valve 2' which rises from its seat until the pressure has returned to the normal. \Vhen the production of a tremulous sound is desired, the movable ring u is turned in such a manner that its slit 6 no longer coincides with the slit 8 of the cylinder 7'. On the bulb Z) being then pressed the air expelled by this bulb forces the piston Z, until the lug r encounters the flange a of the ring a. The piston stops at this moment, and the air, continuing to act on the bottom of same, forces back the valve socket p which moves along inside the perforated sleeve n and uncovers the lateral apertures n of this latter. At this moment the air pressure sinks and the socket p is forced suddenly back on to its seat by the coiled spring 9. The air again acting on the bottom of the socket 79, this latter again moves along inside theperforated sleeve n and uncovers the lateral apertures in the same and so on as long as the air in the bulb is not exhausted. Since this movement of the socket p is repeated with great rapidity, the air escapes intermittently through the apertures a and entering the chamber (Z produces a tremulous sound by its passage under the reed g. The air contained in the perforated sleeve n and which is not driven back by the socket p, escapes through the aperture 91 of the cap n In order to prevent the emission of sound completely it is sufficient to move the lug 1 into the lateral slit 3 of the cylinder j. The piston Z is thus rendered immovable and, as this piston masks the aperture 72, for the outlet of air, the apparatus cannot emit any sound, even when the bulb Z) is pressed. From the foregoing it will be evident that with the apparatus arranged as described, it is possible to obtain at will either a uniform or a tremulous sound, or to suspend the emission of sound entirely, according to the position given to the trembler, which may either slide freely within the metal cylinder j or traverse a distance limited by the movable ring a, or be rendered perfectly immovable by causing the lug r to engage in the lateral slit 8 It is understood that this system of trembler can be applied to all forms of warning apparatus, operated by air, steam or gases of any kind.

Where a bulb is employed this latter may be connected with the tube 0 either directly or by means of a flexible tube.

The arrangements described above are given merely by way of example, and may be modified, as regards shape, dimensions and disposition in points of detail, according to circumstances, Without modifying the principle of the invention.

Claim:

1. A horn, comprising a chamber, sound producing means in the chamber, a second chamber communicating with the first chamber, a fluid pressure device connected with the second chamber, a trembler movably mounted in the second chamber, and means for adjusting the trembler.

2. A horn, comprising a chamber, sound producing means in the chamber, a second chamber communicating with the first chamber, a fluid pressure device connected with the second chamber, a trembler movably mounted in the second chamber and having openings and a valve controlling the openings, and means for adjusting the trembler.

3. A horn, comprising a chamber, sound producing means in the chamber, a second chamber communicating with the first chamber, a fluid pressure device connected with the second chamber, a hollow and spring pressed piston in the second chamber and provided with an opening in one side, a perforated sleeve within the piston and carried thereby, the perforations of the sleeve registering with the opening of the piston, a sliding and spring pressed valve for controlling the openings of the sleeve,

and means for limiting the movement of the piston.

at. A horn, comprising a chamber, sound producing means in the chamber, a second chamber communicating with the first chamber, a fluid pressure device connected with the second chamber, a hollow and spring pressed piston in the second chamber and provided with an opening in one side, an apertured sleeve within the piston and carried thereby, said sleeve having one end open to the fluid pressure device and its apertures registering with the opening of the piston, a socket-shaped valve for closing the end of the sleeve and the openings thereof, and means for limiting the movement of the piston.

5. A horn, comprising a reed chamber, a chamber communicating with the reed chamber, and provided with an angular slot, a slotted ring rotatably mounted on the said chamber and provided with a slot adapted to register with the slot of the chamber or to be moved out of register therewith, an air bulb connected with said chamber, a hollow and spring pressed piston in the slotted chamber and provided with a stud working in the slots of the chamber and ring, said piston being open at one end and provided with an opening in its side, a perforated sleeve within the piston and carried thereby, said sleeve being open at one end to the air bulb and its apertures registering-with the opening of the piston, and a spring pressed socket-shaped valve in the sleeve for closing the end of the sleeve and the openings thereof. 1

6. A horn, comprising a chamber, sound producing means in the chamber, a second chamber connected with the first chamber, a fluid pressure device connected with the second chamber, and means for establishing a uniform or intermittent communication between the said chambers whereby to produce a uniform or tremulous sound.

The foregoing specification of my automatic trembler particularly applicable to warning apparatus, signed by me this 15th day of December, 1908.

ETIENNE TESTE.

VVit-nesses R. CHERIOT, H. C. Coxn. 

